Electric-arc lamp.



No. 655,808. Patented Aug. I4, |900.

-B. A. STWE.

ELECTRIC ARC LAMP. (Applimi'on med July 1o, i899.)

(No Model.) 4 Sheets-Sheet I umm mmm I 1"/ I/ YVESSE S [N VEN T OR No.655,808. Patented Aug. I4, |900.

B. A. STWE.

ELECTRIC ARC LAMP.

(Application led July 10, 1899. (No Model.) 4 Sheets-Sneek 2.

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/NVENTOR M W/TNESSES msN ooooooooooooooooooooooooooooooooooooooo uc No.655,808. Patented Aug. I4, |900. B. A. STDWE.

ELECTRIC ARC LAMP.

(Application filed July 10, 1899.1

4 Sheets-Sheet 3.

(No Model.)

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No. 055,000. Patented Aug. 14, |000.l s. A. sT0wE.

ELECTRIC ARG LAMP.

[ Appncation med July 1o, 1s99.\

4 Sheets-Sheet 4.

(No Model.)

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A Harney UNrrnD STATES PATENT Ormea,

BERNARD A. STOWE, OF CLEVELAND, OHIO, ASSIGNOR TO THE JANDUSELEOTRIOOOMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

srncrrrcarron forming part of Letters raten No. 655,808, dated August14, 19oo. Application filed July l0, 1899; Serial No. 723,401. (Nomodel.)

To c'tZZ 1072/0771/ it' may con/037%:

Beit known that I, BERNARD A. STOVVE, of Cleveland, in the county ofCuyahoga and State ot' Ohio, have invented certain new and usefulImprovements in Electric-Arc Lamps; and I do herebydeclare the followingto bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

Myinvention relates to an improvement in electric-arc lamps, and moreparticularly to such as are constructed and adapted to operate withalternating or pulsating currents, one object of the invention being to,utilize the inductive resistance or choke coil of an alternating orpulsating current arc-lamp for controlling the separation and feed ofthe carbons.

A further object ,is to provide means whereby the inductive resistanceor choking coil of an alternating or pulsating current arc-lamp can bemade to regulate and control the operation of the lamp without theassistance of electromagnets or solcnoids and their armatures or cores.

A further object is to provide simple and efficient means for adjustingand adapting the regulating mechanism of an alternating or pulsatingcurrent arclamp to the conditions ofthe circuit.

A further object is to reduce to a minimum the number of moving parts inthe regulating mechanism of an electric-arc lamp.

A further object is to provide a simple clutch device for anelectric-arc lamp.

A further object is to provide an arc-inclosed electric-arc lamp with asingle holder for both globes, so that in trimming the lamp both globescan be detached simultaneously.

A further object is to improve and simplify the construction ofalternating or pulsating current electric-arc lamps, to insure theaccurate operation of the regulating mechanism and the steady burning ofthe lamp, and to so construct the various details as to render theentire lamp effectual in every respect in the accurate performance ofits functions.

' lVith these objects in View the invention consistsin the combination,in an alternatingcurrent electric-arc lamp, of aclutch, a sta-`tionaryinductive resistance comprising a coil land a core having twopoles, a movable coil mounted to approach and recede from the maxim umdensity of the field of force between the poles of the inductiveresistance, said movable coil having its. ends connected to the coil ofvthe inductive resistance, so as to be in circuit therewith, whereby theelectromotive force of said movable coil will vary in direct proportionto the variations of the electromotive force in the coil of theinductive resistance, and connections between the movable coil and theclutch.

The invention further consists in the combination, in an electric-arclamp, of a slotted choking-coil, feeding mechanism for controlling thefeed of the movable carbon or electrode, an armature for controlling thefeeding mechanism, the said armature consisting of a coreless coilincluded in circuit with the choking-coil and so located as to enter theslot ofthe choking-coil and be in operative relation to the pole-piecesthereof bounding the slot.

The invention further consists in the combination, in analternating-current electricarc lamp, of an inductive resistance havingan air-gap between the poles ofits core, a mov` able conductor ofnon-magnetic material disposed in said air-gap and included in circuitwith the coil of the inductive resistance, a clutch, and connectionsbetween the clutch and movable conductor.

My invention further consists in the combination, in analternating-current electric- -arc lamp, of an inductive resistanceor'choke 'coil provided with a laminated core having its poles soarranged that a field of force will be generated between them, a workingcoil of wire having no core movably supported in position to be actuatedby the iiuctuations of said field of force, said working coil includedin series with wire of the inductive resistance or choke coil, and meansfor utilizing the movements of said working coil to regulate and controlthe burning of the lamp.

My invention further consists in various v novel features ofconstruction and combinations and arrangements of parts, as hereinafterset forth, and pointed out in the claims.

In the accompanying drawings, Figure l is an elevation of my improvedlamp. Fig. 2 is IOO 2 esaeoe a sectional view. Fig. 3 is a sectionalview taken at right angles to Fig. 2. Fig. Lt is a horizontal sectionalview on the line a; of Fig. 3. Figs. 5, 6, 7, and 8 are detail views.Figs. 9 and 10 are diagrammatical views.

A represents the central stem or tube of the lamp wherein the uppercarbon moves, as hereinafter more fully described, and the lower end ofsaid stem or tube passes through and is secured to a hood B. The hoed Bis provided centrally with an upwardly-projecting integral neck 1 and atrespective sides of said neck with upwardly-projecting integral sleeves2 2, terminating at their upper ends in the same horizontal plane as theupper end of the neck, said neck and sleeves thus serving as supportsfor acircular plate Tubular rods it pass through the sleeves 2 and plate3 and preferably have their upper ends flanged or upset. The tubularrods At are secured to the sleeves by means of setscrews 5 and dependthrough the hood B, at respective sides of the center thereof. The cover6 for the inner or arc-inclosing globe 7 is supported by the lower endsof the tubes 4, for which purpose the cover is provided atdiametrically-opposite points with hollow bosses 8, in which said tubesare secured. A disk 9, of cushioning material, is secured to the underface of the cover G to form a seat for the upper end of thearc-inclosing globe, and to the upper face of said cover a gascheck cap10 is secured by screws 11, but insulated therefrom by means of asuitable gasket 12. The cap 10 is provided centrally with a hole 13 anda depending sleeve 14E, communicating therewith, for the passage of theupper carbon, said sleeve having an internal diameter appreciably largerthan that of the carbon and provided internally, at a point between itsends,with an annular flange or rib 15 to guide the upper carbon. A ring1G is secured to the under side of the cover G by means of the screws11, which latter are insulated from the cover 6 and gas-cap 10 by meansof suitable collars of insulating material. The ring 16 is made on itsunder face with a perforated boss 17, with which one of the screws 11 isin electrical connection, and to said screw the conductor 1S,constituting one terminal of the lamp, is connected, said conductorbeing passed upwardly through one of the tubular rods t. The perforatedboss 17 serves to receive and support the lowercarbon holder 19, whichis disposed within the arc-inclosing globe 7. The lower-carbon holdercomprises a collar 19, having a perforated boss 191) for the receptionof the lower end of the rod or arm 19C, by which the carbon holder orcollar, per sc, is supported. The boss 19b is made with a transversehole communicating at one end with the hole in said boss, into which therod or arm 19c projects, and at its other end with the collar 19, and insaid transverse hole a small longitudinally-movable pin 19d is disposed.At the opposite side of the collar 19 a set-screw 19e passes through thewall thereof and adapted to engage the carbon. From this constructionand arrangement of parts it will beseen that when the carbon is securedin the collar or holder 19n the pin 19I will be pressed against the armor rod 19C to securely hold the carbon holder or collar in place. XVhenthe set-screw is loosened, pressure against the pin 19l will therelieved, and the carbon holder or collar can be turned on the rod tobring it in convenient position for removing the old carbon andreplacing it bya new one, the collar being` prevented from dropping by ahead 19f on the lower end of the arm or rod 19. By means of the samedevices I am enabled to accurately adjust the lower carbon in properalinement with the upper carbon. The upper end of the globe 7 issomewhat enlarged to form an annular shoulder 20, by which the globe issupported upon the inwardly-projecting flange 21 of a dish-shaped holder22. The holder 22 is provided with an outwardly-project/iug peripheralflange 23, at diametricallyopposite points on which perforated bosses 2lare cast for the reception of longitudinally-movable pins 25, adapted toenter open slots 26, located at diametrically-opposite points in thedepending peripheral portieri of the hood Each pin is provided with. aknob or head 27, by means of which to manipulate it, and with a cam 2Sto engage lugs 29 at respective sides of the slots 2G. In applying theholder' the pins will be first pulled outwardly and then passed upthrough the slots 26,with the peripheral flange of the holder disposedwithin the depending peripheral portion of the hood 13. The pins willthen be pressed inwardly until the cams 28 bear against the outer faceof the hood. The pins will now be turned by the lamptrimmer to cause thecams to engage the lugs 29, and in this way the holder can be drawn upand insure the firm bearing of the open end of the arc-inclosing globeagainst the cover f5. The flange 230 at the open end of the large outerglobe 3l (or of a reflector, il such be used instead of an outer globe)is made to bear against a peripheral flange 23 of the holder and will beheld in such position by means of screws 32 passing through the wall ofsaid holder. The heads Si) of the screws 32 are disposed within theholder, and the outer globe will bc connected with the holder before thelatter' is connected with the hood l. Chains B-t are attached at one endto the holder 22 and at the other end to the rods or tubes et and serveto suspend the holder from the lam p-frame when detached from the hoodll.

By the construction and arrangement of parts above described it will beseen that l provide a single holder for the two globes, that both globescan be removed simultaneously and suspended from the lamp-frame topermit ready access 'for the purpose of trimlming, and that thefastening devices for connecting the holder with the hood 13 serve alsoICO to insure contact of the inner globe against its seat with theproper degree of pressure.

Having described the frame of the lamp and the manner of connecting theglobes therewith, I will now proceed to explain the construction andoperation of the appliances for regulating and controlling the operationof the lamp.

A series of posts 35, of non-magnetic material, are located upon theplate 3 and have secured to their upper ends the annular laminated core36 of a horizontally-disposed inductive resistance or choke coil 37. Theadjacent ends of the core 36, between which the air-gap is formed, arepreferably cut tangentially, said adjacent ends of the core constitutingpoles 39, between which a iield of force will exist when the core isenergized by the current passing through the coil 37. It is this eld offorce generated between the poles forming the air-gap of the inductiveresistance or choke coil that I propose to utilize for regulating theseparation and feed of the carbons. To this end I employ a coil of wire40 (without a core) and so mount said coil that it shall be moved by theinductive action of the iield of force between the poles 39, themovement of the coil thus effected being transmitted to the clutch forthe upper carbon for the purpose of first separating the latter from thelower carbon to establish the arc and subsequently manipulating saidclutch during the variations of the lamp-circuit to effect the accuratefeed of the upper carbon. The coil 40 is preferably included in serieswith the coil 37, as shown in Fig. 9, or with a portion thereof, asshown in Fig. lO, and is so connected that a current will iiow throughit in the same direction as that of current flowing through the coil 37,so that the magnetic ield of force will act to draw the coil toward themaximum density of said field. By reversing the connections of eitherworking coil or inductive resistance-coil and modifying the translatingdevice equally good operation may be secured. In such case a repulsiontakes place, tending to move the working coil to a flux of decreasingdensity, which movement by suitable means can be made to draw andmaintain the arc.

The coil 40 will preferably be wound with suitable insulating-tape andmay be conveniently supported by a cup or holder 4l, secured to one endof a shaft 42, mounted in suitable bearings on the plate The cup orholder and the shaft to which it is secured are so disposed that one legof the working coil 40 will be normally disposed to one side ofthecenter of air-space between the poles 3f), so that when current is madeto flow through the coil 37 and a field of force is thus generatedbetween said poles the said leg of the coil will be drawn toward thepoint of maximum density of the lines of force in line with the axes ofsaid poles, thus causing the shaft 42 to turn in its bearings andtransmit motion to the clutch mechanism. A

long arm 44 is secured at one end to the shaft 42, and the free end ofsaid arm is pivotally connected with the plunger-rod 45 of an air-pot46, supported by a suitable arm or bracket 47, secured to the centralstem or tube of the lamp. The arm 44 is also pivotally connected at itsfree or inner end with the upper end of a rod 4S, which depends freelythrough holes in the plate 3 and hood B, and attached at its lower endto a clutch C, disposed Within the hood B, said clutch preferably beingof a construction presently to be explained in detail. A spring 48 iscoiled on the shaft 42 and secured at one end to the arm 44. TheA otherend of the spring 48 is secured to a notched wheel 49, mounted on theshaft 42 and adapted to be engaged by a dog 50, attached to the plate 3.

When no current is iiowing through the lamp, the leg of the working coilnearest the poles 39 should be so disposed as to be just within thespace marked by the longest lines of force between said poles when thelatter are energized, so that when current first enters the lamp theworking coil will be moved toward the point of maximum density of thefield a distance sufiicient to effect the full or normal separation ofthe carbons. The width of the field of force, or, in other words, thepositions of the longest and least dense lines of force, will depend onthe number of ampere-turns of the inductive resistance-coil 37, and thenumber of ampere-turns given the coil in a particular lamp will dependon the frequency of the current on the line in which the lamp is to beused, and the density of the iield of force between the poles of thecore 38 will depend upon the same considerations. It is important,therefore, to 'provide means for adjusting the normal position of theworking coil to such position relatively to the longest lines of forceand also to adjust the resistance offered to the movement lof theworking coil to the strength or density of the iield of force accordingto the prevailing conditions under which the particular lamp is to beoperated. The adjustment of the normal position of the coil relativelyto the edge or longest lines of the field of force can be readilyaccomplished by turning the arm 44 on the shaft 42 more or less in onedirection or the other until the outer leg of the working coil assumesthe proper position and then securing said arm rigidly to the shaft bymeans of the set-screw. The workin g coil can be easily adjustedrelatively to the strength or density of the field of force between thepoles 39 by means of the spring 4S, the tension of which will beincreased or diminished by turning the notched wheel 49 more or less inone direction or the other. The spring 48a really has a double function,that of compensating for the vertical component of force due to theweight of the Working coil operating at the end of a horizontal lever(imaginary) of variable length, depending upon the angle of inclinationof the coil with the IOO 4 esasoe horizontal, and of assisting orresisting the action of the eld of force, depending upon the relativeposition of the working coil with respect to the maximum intensity ofthe field of force set up by the inductive resistance. Whether thespring assists or resists the action of the field of force does notdestroy its availability as a means for adjustment of the currentconsumptionof the lamp.

The upper carbon of the lamp is, as before stated, disposed within thecentral stem or tube A of the lamp, and within said stem or tube aholder 5l for upper carbon is located. The holder 5l consists of a metalsocket-piece having the socket therein made slightly tapering or conicaland having its wall serrated or roughened, as at 52. The carbon-'rodwill be passed upwardly into the tubular stem A until it engages Atheholder, and it will then be pressed up quickly, causing the holder tostrike the cap on the stem and the carbon to be thus forced or wedgedinto the tapering roughened socket, where it will remain until forciblyextracted. The carbon can be thus quickly and effectually secured to theholder and the latter will follow the carbon to the clutch O, at whichtime only a small section of carbon will be unconsumed. The gas-checkcap acts as a guide for the carbon below the clutch.

The clutch and contact devices which I employ are important features ofthe lamp, and their construction and operation will now be described indetail.

The frame 5a of the clutch and contact devices for the upper carbon isrectangular in general form,its parallel members being made withoutwardly-projccting curved portions 55 to form an enlarged opening forthe free passage of the carbon, and said parallel members are connectedat one end by one inclined cross-bar or end wall 56, against which aserrated clutch-ring 57, disposed in the frame, is adapted to bear, saidring being made of metal or of other material-such as porcelain,marble,ivory,&c.-as may be desired. The clutchring 57 is not providedwith a hub and is loosely disposed in the frame 54, normally resting onthe plate or cap when no current is flowing through the lamp. A screw 58passes through the members of the frame 54 and through the clutch-ring57 and serves to prevent possibilityof escape of said ring, said screwalso serving as means for attachment of the rod 4S of the regulatingmechanism to the clutch-frame 5ft. Acontact-wheel 59, of good conductingmaterial, such as will not easily corrode, is mounted between the freeends of the frame 54E and is provided with a grooved periphery, so thatit will readily conform to the carbon-rod. The contact-wheel 59 projectsbeyond the end of the frame 5a and is guided between uprights orchairs60, secured to the cap or plate 6, said uprights being provided withbeveled or inclined seats 6l for the reception of the projecting ends ofthe shaft 62, on which the contact-wheel is mounted.

At rest the clutch-ring 57 will bear upon the cap (l, which acts as thereleasing-plate, and the frame 5i will have dropped away from theclutch-ring and also rests upon said plate or cap, said frame swinging,in moving to such position, on a center, (indicated at b.) In thisposition the clutch-ring 57 will not impinge against the inclined endwall 5G of the frame 54 and the carbon simultaneously, and consequentlythe upper carbon will rest freely upon the lower carbon. Thecontact-wheel 59 is also at a position of rest when no current isflowing through the lamp, the shaft of said wheel bearing upon theinclined seats of the chairs or uprights 60. The inclined seats 6l ofthe chairs or uprights GO cause the contactwheel 59 to bear against thecarbon-rod with a certain horizontal component of force, depending uponits weight and the inclination of said seats. This component of forceserves to insure Contact of the wheel 59 against the carbon-rod, but notwith such pressure as to prevent the rotation of the wheel on its shaftor the proper feeding of the carbon-rod. In this position of rest theelectrical connection between the frame 5i and the carbon-rod iseffectually maintained. Current is conveyed to the frame 54C by means ofa conductor 69, passing up through one of the tubes L and connectedthrough the regulating mechanism with the one terminal of the lamp.

In starting the lamp the rod L18 will beactuated or pulled upwardly bythe regulating mechanism, and thus first cause the frame 5i to be raisedor turned on the point as a center until the clutch-ring 57 impingesagainst the wall 56 atg and the carbon rod at 7L. The upward movement ofthe clutch-rod #i8 will now cause the clutch-ring to grip the uppercarbon and raise both clutch and carbon until the regulating mechanismhas reached a position of equilibrium, in which position a normal arcobtains. The entire clutch then hangs from the rod 48, and beingpivotally supported the weight of the contact-wheel 59 will cause theframe 54E to become disposed at an angle with respect to the horizontal,depending upon the size of the carbon and the relative position of theclutch-ring, thus insuring a uniform contact-pressure of the rings 57and 59 upon the carbon rod. As the clutch lowers, due to the regulationof the actuating mechanism of the lamp, the projecting ends of the shaftor stud (52 eventually come to rest upon the inclined seats 6l of thechairs (50, the angle of which seats determines the contact-pressure ofthe contact-ring 59 against the carbon rod. Further descent of theclutch-rod causes the frame 5i to move in the arc of a circle, of whichthe point Z) is the center, causing a further descent of the carbon rodin the process of feeding until the clutchring 57 comes to rest on thecap or plate. -As the rod 48 continues to descend the clutchring remainsstationary and the frame 5l swings downwardly and away from said ring,thus releasing the latter and permitting the IOO carbon to drop, andthereby restoring, in conjunction with the regulating mechanism, anormal iow of current. During the feeding of the upper carbon thecontact-wheel 59 maintains a constant pressure upon the carbon rod.

Instead of the chairs or uprights above described a lever 65, pivoted at66, might be employed, said lever having a slot or hook 67 at its lowerend for the reception of the shaft or stud of the contact-wheel. thelever G5 will be exactly the same as that of the inclined bearing edgesof the chairs or uprights and the contactpressure of the wheel 59against the carbon rod made dependent upon the weight of contact-wheeland the inclination of the lever. The slot or hook of the lever engagingthe shaft or stud on which the wheel 59 is mounted permits the verticalmovement of said wheel and its unbroken contact with the carbon rod.

The lamp-circuit can be conveniently traced from the line to one end ofthe inductive resistance-coil, through said coil or a portion thereof toone end of the working coil, from` the other end of said working coil bythe conductor to the clutch from 54, thence to the upper carbon, then tothe lower carbon, and then to the line by the lower-carbon holder andthe conductor.

Numerous changes might be made in the details of my invention Withoutdeparting from the spirit thereof or limiting its scope, and hence I donot wish to limit myself to the precise details herein set forth.

Having fully described my invention, what I claim as new, and desire tosecure byLetters Patent, is-

l. In an electric-arc lamp, the combination with a clutch and a magnet,of a movable coreless coil disposed within the field of force of themagnet so as to be actuated by the iiuctuations thereof, and connectedwith the clutch, said movable coreless coil included in circuit with thecoil of the magnet.

2. In an alternating-current electric-arc lamp, the combination with aclutch and a stationary inductive resistance comprising a coil and acore having two poles, of a movable coil mounted to approach and recedefrom the maximum density of the field of force between the poles of theinductive resistance, said movable coil having its ends connected withthe coil of the inductive resistance so as to be in circuit therewith,whereby the electromotive force of said movable coil will vary in directproportion to the variations of the electromotive force in the coil ofthe inductive resistance, and connections between said movable coil andthe clutch.

3. In an arc-lamp, the combination of a slotted choking-coil, feedingmechanism for controlling the feed of a movable carbon or electrode andan armature for controlling the feeding mechanism, the said armatureconsisting of a coreless coil included in circuit The functions ofv 4.In an alternating-current electric-arc lamp, the combination with aninductive resistance having an air-gap between the poles of its core, ofa non-magnetic movable conductor disposed in said air-gap and includedin circuit with the coil of the inductive resistance, a clutch andconnections between said clutch and movable conductor.

- 5. In an electric-arc lamp, the combination with a coil included inthe lamp-circuit and a core within said coil, the poles of said coredisposed opposite each other, of a conductor of non-magnetic materialmovably mounted so as to enter the field of force between said poles andincluded in circuit with said coil and means connected with said movableconductor for regulating the burning of the lamp.

6. The combination in an alternating or pulsating current electric-arclamp, of a stationaryinductive resistance and a conductor included incircuit with said inductive resistance and disposed in the field offorce between the poles thereof to regulate and control the separationand feed of the carbons. 7. The combination in an electric-arc lamp, ofa stationary inductive resistance, a movable coreless coil included incircuit with said inductive resistance and adapted to be actu-` ated bythe field of force between the poles thereof, and means for utilizingthe movements of said coil to regulate and control the burning of thelamp.

8. The combination in an electric-arc lamp, of an inductive resistance,a clutch and a mov able coreless coil included in circuit with saidresistance and connected with said clutch said movable coil arranged tobe actuated by said inductive resistance.

9. The combination in an alternating or pulsating current electric-arclamp, of a fixed choke-coil having a laminated core, the poles of whichare so disposed that a field of force will be generated between them, amovable coreless coil included in circuit with chokecoil and arranged tobe actuated by the fluctuations of said eld of force and means forutilizing the movements of said movable coil to control the separationand feed of the carbons.

IO. The combination in an alternating or pulsating current electric-arclamp, of an inductive resistance or choke-coilprovided with a laminatedcore having its poles so arranged that a iield of force will begenerated between them, a working coil having no core, normallysupported in position to be actuated by the iiuctuations of said fieldof force, said working coil included in series with the inductiveresistance or choke-coil and means for utilizing the movements of saidworking coil to regulate and control the burning of the lamp.

IOO

11. In an alternating or pulsating current electric-arc lamp, thecombination with a coil having the poles of its core arranged so that afield of force will be generated between them, a movable coil includedin circuit with the first-mentioned coil and adapted to be actuated bythe fluctuations of said field of force, devices connected with saidmovable coil for controlling the burning of the lamp and means foradjusting the normal position of said movable coil to the width anddensity of said field of force.

12. In an alternating or pulsating current electric-arc lamp, thecombination with a coil provided with a core having its poles sodisposed that a field of Vforce will be generated between them, anoscillatory shaft, a working coreless coil secured to said shaft andadapted to be actuated by the fluctuations of said field of force, saidworking coil included in circuit with said 'first-mentioned coil, acarbon-clutch and connections between said clutch and shaft.

13. The Combination in an alternating or pulsating current electric-arclamp, of a coil provided with a core having its poles so arranged that afield of force will be generated between them, a pivoted coil sodisposed as to be actuated bythe fluctuations of said field of force, anarm projecting from the pivoted coil, means for adjusting said armrelatively to the said coil, a carbon-clutch and a connection betweensaid arm and clutch.

14. The combination in an alternating or pulsating current electric-arclamp, of a coil provided with a core having its poles so arranged that aheld of force will be generated between them, an oscillatory shaft, aworking coil attached to said shaft and so disposed as to be Aactuatedby the fluctuations of said field of force, a carbon-clutch connectedwith said working coil, a spring connected with the coil and means foradjusting` said spring relatively to the size and density of said fieldof force, and to compensate for the variations in the tangent of theangle which that axis of the working coil which passes through the pivotof the same makes with the horizontal.

15. rilhe combination in an alternating or pulsating currentelectric-arc lamp, of an inductive resistance provided with a corehaving its poles so arranged that a field of force will be generatedbetween them, an oscillatory shaft, a cup or holder secured to saidshaft, a working coil supported by said cup or holder and adapted to beactuated by the fluctuations of said field of force to oscillate saidshaft, an arm projecting from said shaft, a carbon-clutch connected withsaid arm, a spring on the shaft and secured at one end to said arm andan adjusting` device to which the other end of said spring is secured.

16. The combination in an electric-arc lamp, of an inductive resistanceprovided with a core having its poles so arranged that a field of forcewill be generated between them, a pivoted working coil included incircuit with the inductive resistance and adapted to enter said fieldol' force and be actuated bythe fluctuations thereof, an arm projectingfrom said pivoted working coil, a carbon-clutch, a rod connecting saidarm and clutch, an air-pot and a connection between the plunger of saidair-pot and said arm.

17. In an electric-arc lamp, the combination with a frame, of a concaveor dish-shaped holder having a hole therein for the accommodation of anarc-inclosing globe, aperipheral flange on said holder against which theupper edge of an outer globe or reflector bears and set-screws passingoutwardly through the wall ot' the holder below said peripheral flange,for supporting said outer globe or reflector and cooperating with saidperipheral flange to hold the outer globe rigid.

18. In an electricarc lamp, the combination with a frame andarc-inclosing globe-cover secured to said frame, of a holder for thearcinclosing globe, and cams carried by said holder and adapted toengage the lam pframe and simultaneously draw the upper end of t-heglobe up against said cover.

19. In an electric-arc lamp, the combination with a hood and means forsupporting the saine, said hood having open slots in its vcrtical walland lugs or shoulders at respective sides of each slot, of a holderconstructed and adapted to support an inner or arc-inclosing globe,outwardly-projecting pins mounted in said holder to have longitudinaland revoluble movements, said pins adapted to enter the open slots inthe hood, and cams on said pins to engage the lugs or shoulders on thehood.

20. In an electric-arc lamp, the combination with a frame, of anarc-inclosing globe-cover secured thereto, a gascap secured upon andinsulated from said cover, a collar depending from said cap and throughthe cover for the passage of the upper carbon, said collar having aninternal annular rib to guide the carbon, a ring secured to andinsulated from the under face of said cover and a lower-carbon holdersecured to said ring.

21. In an electric-arc lamp the combination with the regulatingmechanism of a clutchframe suspended therefrom, one or more clutchingmembers mounted on said frame, one or more contacting members, alsomounted thereon, adapted to conduct the current to the upper carbon, andmeans for movably supporting a portion of said frame to maintain thecontact member or members in conn stant engagement with the carbon.

22. In an electric-arc lamp, the combination with the regulatingmechanism, of a clutchframe suspended therefrom, a clutch member mountedin said frame, a contact member also mounted in said suspended frame andmeans operating automatically to maintain the contact member constantlyagainst the carbon.

23. In an electric-arclamp, the combination with regulating mechanism,of a clutch-frame IOO IIO

suspended therefrom and means for movably supporting each end of saidframe and a clutch member and a Contact member for the carbon, mountedin said suspended movablysupported frame, one of the supports for theframe being constructed and adapted to normally maintain the Contactmember against the carbon.

24. In an electric-arc lam p, the combination with the regulatingmechanism, of a frame suspended therefrom and adapted to permit thepassage of the upper carbon through it, a clutch-ring mounted freelyWithin one end of said frame so as to be at one side of the carbon,means for causing said clutch-ring to bind against the carbon, acontact-wheel for the carbon mounted in the other end of said trame andmeans for movably supporting said last-mentioned end of the frame tomaintain the contact-wheel in constant engagement with the carbon.

25. In an electric-arc lamp, the combination with the regulatingmechanism, of a frame suspended from said regulating mechanism andadapted to-permit the passage of the upper carbon through it, aclutch-ring mounted in one end of said frame, a contact-wheel mounted inthe other end of the frame, and stops for the respective ends of theframe, the stop for the end of the frame carrying the contact-wheelbeing disposed in a plane above that of the stop for the other end ofthe frame and constructed to press the contact-wheel against the carbon.

26. In an electric-arc lamp, the combination with the regulatingmechanism, of a frame suspended from said regulating mechanism andadapted to permit the passage of the npper-carbon rod, a plate belowsaid suspended frame, a clutch-wheel mounted loosely in one end of saidframe and adapted to normally rest on said plate, a contact-Wheel forthe carbon rod mounted in the other end of said suspended frame and anupright or chair on said plate and having an inwardly-beveled portion tobe engaged by the end of the frame carrying the contactwheel.

27. In an electric-arc lamp, the combination with the regulatingmechanism and a frame suspended from said regulating mechanism andadapted to permit the free, passage of the upper-carbon rod through it,one end of said frame having a beveled cross-bar or end Wall, of aclutch-ring mounted loosely in said frame and adapted to engage saidbeveled cross-bar or end wall, a plate under the frame to receive theclutch-rin g and the end of frame in which it is mounted, a contactwheel mounted in the other end of the frame, studs projecting laterallyfrom the end of the frame in which the contact-wheel is mounted, and twostandards mounted on the plate under the suspended frame and embracingthe contact-wheel so as to form a guide therefor, said standards havinginwardly beveled shoulders to be engaged by said studs to maintain thecontact-wheel in constant engagement with the carbon rod.

2S. In an electric-arc lamp the combination with an arm or rod, of acarbon-holding collar having a perforated boss for the reception of saidrod, a pin disposed between the colA lar and boss and adapted to projectinto the bore of both and a set-screw passing through the wall of saidcarbon-holding collar at the opposite side thereof from said pin.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

BERNARD A. STOIVE.

